CURRENT RESEARCH INTERESTS
1. Resistive Switching Devices
In the recent past, our work has focused on fabrication of resistive switching devices and understanding the underlying mechanisms of switching. A diverse range of dielectric/ semiconducting materials including TiO2, CuxO, ZnTe, SiC and hybrids such as chitosan or PMMA-Al doped ZnO and electrode materials such as Au, Al, Ag, Ni, Cr, Pt and TiN have been used. The aim is to manipulate the work function of electrode materials and,where relevant,the oxygen scavenging nature to enhance performance of the fabricated devices. A great deal of emphasis is placed on understanding the underlying science by using a variety of probes including Raman spectroscopy, XPS and Electron microscopy.
In the future, the aim is to explore the possibility using this phenomenon for sensing applications.
2. ZnO Based Nanostructures
ZnO based nanostructures have been the focus of our research interest in the recent past. We have developed a self-catalysis based method to produce ZnO nanowires. These nanowires are shown to be superhydrophobic and very suitable for self-cleaning applications. In addition, we have demonstrated their use as SERS substrates. The mechanical behaviour of the nanowires has also been studied. More recently, we have adopted the Hydrothermal synthesis method to develop ZnO nano/micro rod arrays over a variety of seed layers. The nanowires are vertically aligned with interesting wettability, photoluminescence and sensing properties. Ongoing work includes growing these structures on flexible substrates.
3. Development of processes for fabrication of thin-films-based devices on flexible substrates for electronic, optical and optoelectronic applications.
The aim here is to develop cost-effective, low-temperature, environmentally benign and industrially compatible processes for device development on flexible substrates.
4. Bulk and thin films-based sensor development for health and food security.
The aim here is to develop contact-free optical sensing techniques to detect contaminants and adulteration in foods. Another objective is to develop contactless techniques to sense body parameters.